Preparation of Sb2O3/Sb2S3/FeOOH composite photoanodes for enhanced photoelectrochemical water oxidation |
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| Affiliation: | 1. Department of Chemistry, Yeungnam University, Gyeongsan, Gyeongbuk 712–749, South Korea;2. Department of Physics, Erode Sengunthar Engineering College, Erode, India;3. Department of Physics, Coimbatore Institute of Technology, Coimbatore, India;1. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, 1 Sec. 3, Zhongxiao E. Rd., Taipei 10608, Taiwan;2. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 100081 Beijing, China |
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| Abstract: | A novel Sb2O3/Sb2S3/FeOOH photoanode was fabricated via a simple solution impregnation method along with chemical bath deposition and post-sulfidation. The X-ray diffractometry, Raman measurement, and X-ray photoelectron spectroscopy show that the Sb2O3/Sb2S3/FeOOH thin films are successfully prepared. SEM−EDS analyses reveal that the surface of Sb2O3/Sb2S3 thin films becomes rough after the immersion in the FeCl3 solution. The optimized impregnation time is found to be 8 h. The FeOOH co-catalyst loaded Sb2O3/Sb2S3 electrode exhibits an enhanced photocurrent density of 0.45 mA/cm2 at 1.23 V versus RHE under simulated 1 sun, which is approximately 1.41 times compared to the photocurrent density of the unloaded one. Through the further tests of UV−Vis spectroscopy, the electrochemical impedance spectra, and the PEC measurements, the enhancement can result from the increased light-harvesting ability, the decreased interface transmission impedance, and the remarkably enhanced carrier injection efficiency. |
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| Keywords: | FeOOH co-catalyst photoanode carrier injection efficiency |
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